No. 1: Birds are Dinosaurs!

T-Rex: Here's a thing...
T-Rex: BIRDS are DINOSAURS!
T-Rex: Birds are descended from dinosaurs, so are in the same clade, so birds ARE dinosaurs! Cool, huh?
Utahraptor: But dinosaurs are descended from fish...
Utahraptor: So birds are dinosaurs in the same sense that dinosaurs are fish!
T-Rex: But I want to be related to Big Bird, not Jaws!

The author writes:

It's still incredibly cool that birds are descended from dinosaurs, but actually calling them dinosaurs is a little bit sneaky.